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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929b6555d3f8a35e0083955139350b3c3d0e55d456b110aac6ce88ced882a2ab' 
  AND token = 'gMHqq1No8RZkv8DYuTgRdL4X2GCuez8wp7alFHGCLHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}